Commit Message

Description of the Change

The indicator-sound indicator has a great usability issue imho: in fact when using the scroll event over it to change the volume level, no feedback is given (just the not-precise-at-all icon change).

Now I know that tooltips can't be show, but showing a notification via notify-osd like when using the volume keys imho is a good way to give precise informations about the current volume level, keeping coherency with the system.

Trevino, nice work.
I'd like to merge this after alpha 2 ( this week ) if that is okay. Some pressing bugs to see to first. A gsettings entry to switch on or off this would definitely help. I merged a big refactor yesterday which means alot your work below needs to be restructured. Not a biggie, we can look at this next week.